Flue-scraper.



E. KUPKE.

FLUE SCRAPER.

APPLICA .1913. 1,172,368. Patented Feb. 22,1916.

ER ST-Kern; or noNoLULu, TnRRiTonY or Hawaii I ma mas To all whom it may concern 1 I Be it known that I, ERNST Korma, a citizen of the United States, residing at Honolulu, county of Honolulu, Territory of Hawaii, have invented certain new anduseful Improvements in Flue-Scrapers; and I do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use'the same.

This invention relates to flue-scrapers or tools for loosening the scale or incrustation deposited on the inner walls of tubes.

The'object of the present invention is to wits use in tubes of small diameter, for the hinged bars carrying the cutting wheels cannot be brought close enough together.

for'this purpose without so weakening the body as to lose its rigidity.

My present invention contemplates a body with preferably three pins secured therein, and two V-shaped wheels axled on the 'end of each pin. The tool is adapted either to be turned by hand or to be revolved by power within the tube from which it is desired to remove the scale. The pins are secured by set screws in holes drilled in the body,.preferably drilledat a slight inclination to the axis of said body, so as to cause the wheels to describe spiral paths on the inner surface of the tube when the tool is revolved, the wheels thus cutting threads in the hard scale and causing the same to part from the tube, leaving the tube practically clean. The portion of each pin pro jecting from'the body, on which the V- shaped wheels are axled, is made eccentric to that portion which is within the, hole in the body. Cotters are provided in the pins to prevent the wheelsv from coming off when.

7 Specification of Letters iliatent.

thetoolisinoperation. 'The outer end of each pin-is provided with a slot, so that upon loosening theset screw in the body,

the pin may be turned in the hole. in the Patented Feb. 22, 1916.

' Application filed February 12-, 1913. Seria1No.747,947. v

body by means of a screw driver. The posltion of the wheels with respectflto their 1 distance from the center or axis of the body may thus be adjusted, owing to the eccentricity of the pins, so as to bring the'wheels' ust tangent to the inner circumference of the tube-to be cleaned.

In the accompanying drawings, forming a part of this specification, is shown a fluescraper embodying my present invention, in which Figure 1 is an elevation of the fluescraper. Fig. 2 is a view of the cutting end. Fig. 3 is a sectional view on the line AA of Fig. 1. Fig. 4 is a sectional view on the line BB of Fig. 3. Fig. 5 is a view of the endof a pin at right angles to that shown in Fig. 4:. I Fig. 6 is an end view of a pm. v I

Referring to the drawings, the body 1 is preferably shaped as shown and secured by a taper pin'2'to the end of a bar 3 by which the tool is revolved and passed through the tube to be cleaned. Three holes are drilled in the body 1 at a slight inclination to its axis to receive the pins 4 which are clamped therein by the set screws 5. Each pin is so inclined with respect to the longitudinal axis'of the body 1 that a common planecannot be passed through the axis of the body portion and the pin. Theportion 4 of each pin 4 which-projects from the body.

1 is turned slightly smaller in diameter than the portion within thebodyl and is made eccentric to the portion withinthe body 1,

as shown in Figs. 4: and 6. A hole 4* for a cotter 6 is provided near the end of the portion P, Figs. l and 5. The outer end is provided with a slot 4 as shown. Two

V-shaped wheels 7 are aXled on the ends 4* of each pin 1" between the cotter 6 and the body 1, Figs. 1 and 2. The operating bar 3 may be provided with a ring or loose collar 8 having a tapered periphery adapted to fit in the endof the tube being cleaned to guidethe bar 3 and keep it concentric said tube.

with

Q i r 1,172,368

I c1aim:- Wheels, and means toclamp said pins inthe A flue scraper! comprising a body por body portion. tion, Wheel supporting pins set in said body In testimony whereof I aifix my signature, 2 portion, each pinprovided with an eccentric in presence of two witnesses. v 5 outer end projectingbeyondjsaiclbody por- KOLPKE.

tion, cutting wheels-mounted 'on said ecccn Witnesses: tric outer ends, said pins adapted to" be"; THos. R. W. GRAY, turned in said-body p or tion'to ztdjustsaidy F. C. CLEGHQRN.

GoLiesof this patent may be obtained for five cents each, by addressing'thc Commissioner of Patents h ll ts 1 

